Overedge-sewing machine



Nov. 1, 1927.

I 1,647,394 H. CORRALL ET AL OVEREDGE SEWING MACgINE Filed March 13, 1925 I 4 SheetS -Sheet 1 W. 2' (I) j INVENTORS Herbert Corn-3!! i klamas Heyyze.

ATTZRNE Y Nov. '1', 1927.

H. CORRALL ET AL OVEREDGE SEWING MACHINE Fi l-ed March 13. 1925 4 Sheets-Sheei 2 INVENTORS Herbert Cor/"ql/ Janie: Hey w BY TORNEY Nov. 1, 1927.

H. CORRALL ET AL.

OVEREDGE SEWING MACHINE Fiied March 15. 1925 4 Sheets-Sheet 5 INVENTORS f/erberf Cor/:94 BY James Hey qw.

fi TORNEY Nov. 1, 1927.

H. CORRALL ET AL OVEREDGE sEwI'm MACHINE Filed March 13 1925 4 Sheets-Sheet 4 INVENTORS I Henberf Co 5 Jamcs #63906- A ORNEHY #:Pifnted Nov. 11,1927.

HERBERTEQR LL, or HELErisBUnGrI, AND JAMES Ianecirxi;oi" CLYDEBANK. soon- LAND, ASSIGNOBS TO THE SINGER ivrenunaoruaiive COMPANY, OF ELIZABETH, NEW JERSESLA CORPORATION OF NE JERSEY.

OVEREDGE-SEWING IEACHINE.

Application filed March 13, 1925, Serial Ila-15,259, and in Great Bl'ritainMal'ch 26, 1924.

This invention relates primarily to looper mechanism for overedge sewing machines, particularly for glove sewing and similar uses having a thread carrying looper supported by a looper bar adapted to perform 7 longitudinal reciprocatory movements combined with Vibratory movements in a vertical plane as well'as axial oscillatory movement's. p r

The invention also comprises an improved needle-thread controlling and releasing detrating a needle-thread nipping device.

The looper mechanism of the invention. is

shown mounted within a frame comprising the hollow base 1 from which rises the standard 2 provided with the transverse main or driving shaft 3 and with the rock i i v shafts 4 and 5'parallel'thereto.

Secured upon the main shaft 3 are eccentric-s 6 and 7 from which the looper derives components of its movements and the eccentric 8 from which the needle-bar derives en-dwise reciprocatory movements hereinafter explained.

The eccentric 6 is embraced by a' strap at one end of the eccentric rod 9 the other end of which is connected to the lower end of a lever 10 fixed on the 'rock shaft 4: the upper 1 end of which lever 10 is formed integral with a sleeve 11 embracing a pin 12 projecting laterally from a sleeve 13 in which is journalled the looper bar 1 1 confined against endwise movement relatively to the sleeve 13 bya collar 15 and a shoulder 16. At its forward end the looper bar is formed with a socket in which is clamped the shank of the looper 17 As will be understood, the rotation of the eccentric 6 eifectsthe vibration of the lever 10 and thereby effects reciprocatory moveeccentric 7 onthe shaft 3.

ment of the sleeve 13 and thus of the looper bar 141. 1

13 denotes a pendulous link carried on a stationary horizontal pin 19 transverse "to the looper bar 141: and supporting a {pin- 20.

projecting laterally from a coll-ar 21 embracmg the sleeve 13. It will be evident that in the reciprocatorymovement ofthe' sleeve 13 the pendulous link 18 will be 'vibrated on the pin 19-and thereby the pin 20 raised and lowered to tilt thejs'leeve 1'3 and therewiththe'looper bar ll, thereby vibrate ing the looper in a vertical plane.

Above the looper-bar and on the side or ,the looper bar opposite that on which is located the pin 19 is a stationary pin 22"par'al-f lel to the shaft 3, on which pin 22 is pivoted a slotted cam plate 23 'to which in turn is pivoted the upper end of the eccentric rod I v 2 1 the opposite end of which embraces the The cam slot in the plate 23 is enteredlby the ball shaped end of a pin 25proj-e'cting laterally from a collar 26 clamped-to the rear end of the looper bar 14,.the' camslot including intersecting curved portions.

In the rocking movement of the'campl'ate i 23 brought about by the rotation of the eocentrlc' 7 concurrently with" the 'endwise movement ofthe looper 'bar-:'14-, theb'all;

shaped end of the pin 25 is raised and low-1 ered and thereby the looper bar 14: is rocked within the sleeve 13, whereby the looper" 17 is caused to perform oscillatory movements around'the axis of thelooper bar 14. 1

By swinging the pendulo'us can1=plate 23 on its fulcrum 22 located above the looperbar, ashorter and more compact cam can be used and the shape of the cam slot oanb'e simplified and made lessharsh. Hencethe' machine can be used at higher speeds with; out undue. wean.

ltselfwell to giving the looperbar a rela- I The arrangement lends tively large loop-taking movement and a relatively small loop-shedding movement, I as is desirablein the formation and tighten-.

ing of the stitch. At the loop-taking part of the 'movement, the cam is swung forwardly and upwardly around the fulcrum 22 and the highest part or lefthand end of the cam-path Fig. 4, thus raised above the looper-bar. The ballsshaped end of the pin 25, in following the cam, imparts this extra movement to the loopen. On the return or follower 83 carried by the lever-3 t.

loop-shedding movement of the looper, the cam is swung to the right and downwardly, Fig. 4, bringing the high point of the cam nearly in line with the path of the looperbar, so that only a small loop-shedding movement is given tothe looper.

The eccentric 8 is embraced by a strap at one end of an eccentric rod'27 pivoted at the ther end to a lever 28 fixed to the rock shaft 5, said lever 28 being connected by a link 29 to a collar 30 clamped on the rearward end of the needle-bar 31.1 The rotation of the eccentric 8 thus effects reciprocation of the needle-bar 31.

Secured to the rock-shaft l -1s a tappetarm 32 in the form of a plate-spring, Fig.

7, which in the rocking movement of the shafts; engages-the adjustable screw-pin or The .le ver 34 is pivoted at34c and carries at its free end a roller 35 adapted to trackthe element 36 of a needle-thread nipping device carried by the needle-bar. A tension-spring 33 looped at one'end at 33 around the screw 33 and anchored at its other end, to the thumb-nut 88* tends to at all times hold the lever 34: in a floating position wherein the axis of the spring 83 intersects the axis of pivotal movement of the lever '34-, as shown in Fig. 3. In the operation of the machine, at the end of the needle-bar stroke, i. e, when the needle starts to retreat, the roller 35 is caused by the spring-arm 32 to bear with a predeterminedpressure on the element 36 causing the needle-thread a to be nipped. Adjustment of the screw regulates the pressure of the roller 35 upon the nipper element 36.

'1. In an overedgesewing machine, ii

said looper bar is journalled, means for im-- partingendwise reciprocatory' movements axis above said looper-bar, a follower on said looper bar engaging saidslot, and

means for swinging said cam member.

3.111 an overedge sewing mac v ine, in combmatlon with a looper bar'and "'looper carried by said looper bar, sleevein which said looper bar isjournalled,-a niain 'sl1aft, a lever mountedto rOckonan axis parallel to said main-shaft and having one arm pivotally connected to said sleeve for endwise propulsion of the latter, an eccentric on said mainrshaft operatively' connected to saidle'ver,a pendulous link for suspending said sleeve at a point spaced froniits connection withsaid lever, a cam member mounted to swing onja fixed .aXis abovethe looper-bar and parallel to said main shaft,a follower on said looperbar engaging said cam member, and connections between sail main shaft and said cam member forswinging said cam member.

4. In an overedge sewing machine, in con'ibination with a looper bar, means including a rock shaft for imparting endwise reciprocatory movements to said looper bar, a reciprocatory needle bar, a needle-threadnipping device carried by said'needle bar, a lever adapted to influence said nipping device, a tappet arm on sai'd rock shaft, and means influenced by said tappet arm for rockingsaid'lever. v

5. In an overedge sewing machine, in combination, a main shaft, a r cl: shaft operatively; connected with said main shaft, a needle bar-,a connect-ion between said main shaft and said needle bar for reciprocating said needle bar, a needle-thread-nipping device carried by said needle bar, a lever adapted to influence said nipping device, a tappet arm on said rock shaft, and a springurged follower pin adjustably secured to said lever and engageable with said tappet arm. y

In testimony whereof we have signed our names to this specification.

HERBERT CORRALL. JAMES HEG IE,

i (ii) 

